Can be used as a shield, this old American documentation circuit offers digitally selected attenuation values from 1 to 0.0001. The component used is uncommon today.
This conventional bistable power control circuit using triac was found in the June 1970 Radio...
This circuit produces fast light pulses in na incandescent lamp. Pulse rate is adjusted by P1. The...
This circuit was suggested by Siliconix in a 1980s publication. The circuit uses components from the time...